University of Oulu

D. Kumar, J. Kaleva and A. Tölli, "Blockage-Aware Reliable mmWave Access via Coordinated Multi-Point Connectivity," in IEEE Transactions on Wireless Communications, vol. 20, no. 7, pp. 4238-4252, July 2021, doi: 10.1109/TWC.2021.3057227

Blockage-aware reliable mmWave access via coordinated multi-point connectivity

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Author: Kumar, Dileep1; Kaleva, Jarkko2; Tölli, Antti1
Organizations: 1Centre for Wireless Communications, University of Oulu, 90014 Oulu, Finland
2Solmu Technologies, 90620 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2021-10-11


The fundamental challenge of the millimeter-wave (mmWave) frequency band is the sensitivity of the radio channel to blockages, which gives rise to unstable connectivity and impacts the reliability of a system. To this end, multi-point connectivity is a promising approach for ensuring the desired rate and reliability requirements. A robust beamformer design is proposed to improve the communication reliability by exploiting the spatial macro-diversity and a pessimistic estimate of rates over potential link blockage combinations. Specifically, we provide a blockage-aware algorithm for the weighted sum-rate maximization (WSRM) problem with parallel beamformer processing across distributed remote radio units (RRUs). Combinations of non-convex and coupled constraints are handled via successive convex approximation (SCA) framework, which admits a closed-form solution for each SCA step, by solving a system of Karush-Kuhn-Tucker (KKT) optimality conditions. Unlike the conventional coordinated multi-point (CoMP) schemes, the proposed blockage-aware beamformer design has, per-iteration, computational complexity in the order of RRU antennas instead of system-wide joint transmit antennas. This leads to a practical and computationally efficient implementation that is scalable to any arbitrary multi-point configuration. In the presence of random blockages, the proposed schemes are shown to significantly outperform baseline scenarios and result in reliable mmWave communication.

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Series: IEEE transactions on wireless communications
ISSN: 1536-1276
ISSN-E: 1558-2248
ISSN-L: 1536-1276
Volume: 20
Issue: 7
Pages: 4238 - 4252
DOI: 10.1109/TWC.2021.3057227
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by the European Commission in the framework of the H2020-EUJ-02-2018 project under Grant 815056 (5G-Enhance) and in part by the Academy of Finland under Grant 313041 (PRISMA: Positioningaided Reliably-connected Industrial Systems with Mobile mmWave Access), 311741 (WiFiUS) and 318927 (6Genesis Flagship). The work of Dileep Kumar was supported in part by Nokia Foundation; in part by Riitta ja Jorma J. Takanen Foundation; and in part by Tauno Tönningin Säätiön Foundation.
EU Grant Number: (815056) 5G-Enhance - 5G Enhanced Mobile Broadband Access Networks in Crowded Environments
Academy of Finland Grant Number: 313041
Detailed Information: 313041 (Academy of Finland Funding decision)
311741 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
Copyright information: © The Authors 2021. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see